A waterfall has a height of 1500 feet. A pebble is thrown upward from the top of the falls with an initial velocity of 16 feet per second. The height, h, of the pebble after t seconds is given by the equation h=-16t+16t+1500. How long after the pebble is thrown will it hit the ground?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

Susie wants to take her friend out for lunch. she wants to spend $9.75 each person. how much will she spend in all.